Case study:Longstreet A 91a

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Location: 51° 15' 35.35" N, 1° 48' 0.92" W

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Project overview

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Status	Complete
Project web site	http://www.environment-agency.gov.uk/homeandleisure/wildlife/119594.aspx
Themes	Fisheries, Habitat and biodiversity
Country	England
Main contact forename	Mike
Main contact surname	Porter
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.environment-agency.gov.uk
Partner organisations
Parent multi-site project	Case_study:Strategic Framework for Restoration of the River Avon (SFfRRA)
This is a parent project encompassing the following projects	No

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Project summary

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This reach is located to the south of Enford and is 1535m in length. The original reach has been sub-divided into two due to the overall length of the reach (1.5km) and differing channel characteristics. This note therefore refers to the upstream section only, between Enford Bridge and Enford Grange, approximately 0.5km in length. The reach is designated SSSI and SAC. There reach is privately fished. Downstream of Enford Bridge the channel has been altered in the past due to dredging and straightening. The channel is deep and flow is slow and uniform, which is causing the deposition of silt within the channel, obscuring the gravel bed below. The reach is also affected by an impoundment caused by a wooden board and stone weir at Enford Grange. This structure impounds the river for at least 150m upstream and possibly further, resulting in uniform flow conditions and drowned out riffles. The left bank is also being undercut and eroded in a number of places along the reach.

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Impoundment - Before

Impoundment - After

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district South West River basin Hampshire Avon Subcatchment River name Hampshire Avon (Upper) Area category 100 - 1000 km² Area (km2) Maximum altitude category 200 - 500 m Maximum altitude (m) 212212 m <br />0.212 km <br />21,200 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB108043022350 Other case studies in this subcatchment: Gunville Phase I, River Avon Habitat Enhancement, Fifield, River Avon at East Chisenbury, West Amesbury Site Edit site Name WFD water body codes GB108043022350 WFD (national) typology WFD water body name Hampshire Avon (Upper) Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No National/international site designation Local/regional site designations Protected species present No Invasive species present No Species of interest Dominant hydrology Dominant substrate River corridor land use Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 575575 m <br />0.575 km <br />57,500 cm <br /> Project started Works started Works completed Project completed 2013/01/01 Total cost category 10 - 50 k€ Total cost (k€) 3434 k€ <br />34,000 € <br /> Benefit to cost ratio Funding sources Environment Agency Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Stakeholder engagement and communication Works and works supervision Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Impoundments (not hydropower) Hydromorphology Width & depth variation, deposition of silt, erosion Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Gravel berms, Riffle creation, Bank reprofiling Floodplain / River corridor Planform / Channel pattern Lowering of impoundment, Introducing large woody debris, trees hinged Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit Physico-chemical quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Any other monitoring, e.g. social, economic Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Project summary Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information